RS Aggarwal Class 8 Math Ninth Chapter Percentage Exercise 9B Solution
EXERCISE 9B
OBJECTIVE QUESTIONS
Tick (√) the correct answer in each of the following:
(2) 0.8% when expressed as a decimal, is
(3) 6 : 5 when expressed as a percentage, is
(4) 5% of a number is 9. The number is
Solution: Let the required number be x. Then,
5% of x = 9
Ans: (d)
(5) What per cent of 90 is 120?
(6) What percent of 10 kg is 250g?
Ans: Here 10 kg = 10,000 g
(7) 40% of ?= 240
(8) ?% of 400 = 60
Ans: (c)
(9) (180% of ?) ÷ 2 =504
Ans: (d)
(10) 20% of Rs 800 = ?
(11) In an examination, Nitin gets 98 marks. This amounts to 56% of the maximum marks. What are the maximum marks?
Solution: Let the maximum marks be x.
Ans: (c)
(12) A number is first increased by 10% and then reduce by 10%. The number
Ans: (b) decreases by 1%
(13) A period of 4 hours 30 min is what per cent of a day?
Ans: Here 4 hours 30 min = (240 + 30) = 270 min
A day = 24 hours = (24 × 60) = 1440 min
(14) In an examination, 65% of total examinees passed. If the number of failures is 420, the total number of examinees is
Solution: Let the total number of examinees be 100.
Percentage of examinees passed = 65%
Percentage of examinees failed = (100 – 65)% = 35%
Ans: (c)
(15) A number exceeds 20% of itself by 40. The number is
Solution: Let the number be x.
Ans: (a)
(17) 0.05 is what per cent of 20?
(18) One-third of 1206 is what per cent of 134?
(19) x% of y % of?
Solution: Let the required number be z. Then,
x% of y = y% of z
Ans: (a)
(20) What per cent of 2/7 is 1/35?
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